JP2000122600A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the luminance by increasing the light emitting area during an interlace emitting. SOLUTION: Reduction in the luminance is prevented by enlarging the area of a light emitting portion in accordance with an interlace signal. Moreover, in order to prevent the occurrence of a maloperation, sustain electrodes are divided into two groups A and B and the phases are made different from that of scan electrodes. In odd fields, addresses are made valid only for odd scan electrodes and A.C. pulses are applied to only sustain electrodes A during a light emitting. In even fields, addresses are made valid only for even scan electrodes and pulse voltages are applied between even scan electrodes and the sustain electrode group B for light emission. In oder to prevent the occurrence of a wrong discharging, odd scan electrodes and the sustain electrode group A and even scan electodes are made into a same phase so that no voltage is applied. Thus, utilizing the selection for every interlace, the area of non-light emitting portion is made small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device for receiving an interlace signal.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
Is attracting attention as a large display because of its thinness, visibility, and good response. The schematic configuration is shown in FIG. 12 and will be described with reference to the drawing. In FIG. 12, reference numeral 101 denotes a plasma display panel.
1 to S4. The sustain electrode SUS is arranged in parallel with this, and the address electrodes A1 to Am are orthogonally arranged on the opposite side of the space. 102 is a control circuit, 103 is a scan electrode drive circuit, 104 is a sustain electrode drive circuit, and 105 is an address electrode drive circuit. Many gradations per field (mostly 8 to 12)
Are performed by weighting and selecting and emitting the light emission intervals of each subfield. FIG. 13A shows a scan electrode and a sustain electrode for the light emitting portion.

The electrode portion is generally formed of a transparent conductive film, and discharges and emits light at a portion straddling the two. Erroneous discharge between adjacent electrodes (for example, between the scan electrode Si and the sustain electrode located below) is prevented by making the electrode interval wider than the regular portion. FIG. 13B schematically shows the center line of the electrode including the interval shown in FIG.

FIG. 14 shows a driving waveform. In FIG. 14, first, the plasma in the previous field is erased and set in the set period. Next, the address electrodes are driven line-sequentially according to the display information in the address period. In synchronization with this, the scan electrodes are scanned from top to bottom, and the display information is written as the charge amount of the panel. In the next sustain period, an AC pulse waveform is applied between the sustain electrode and the scan electrode, and if there is a written charge, light is emitted and display is performed.

[0005]

However, AC plasma display devices that have been put into practical use in the past are only of the progressive scan type. When a normal video signal is received, a scan conversion circuit is used to convert the signal into progressive scan. I was going. For this reason, there are problems that the cost of this conversion circuit is large and that image conversion is caused by erroneous conversion when a moving image is converted. On the other hand, the plasma display panel compatible with normal sequential scanning has a drawback that when the interlacing operation is performed, the light emitting portion shown in FIG.

[0006]

According to a first aspect of the present invention, a plurality of odd scan electrodes 2i-1 (i = 1 to n) and a plurality of even scan electrodes 2i (i = 1 to n) are provided on a substrate. Sustain electrode A paired parallel to scan electrode
And a pair of sustain electrodes B arranged in parallel with the even-number scan electrodes, and a pitch interval between the odd-number scan electrodes and the sustain electrodes A or between the even-number scan electrodes and the sustain electrodes B is the odd-number scan electrodes. The pitch between the sustain electrodes B or between the even scan electrodes and the sustain electrodes A is set to be wider than the pitch interval, and the odd and even scan electrodes are orthogonally arranged on another substrate which is spaced apart and opposed to the substrate. In a plasma display panel in which a plurality of address electrodes are arranged, in an odd field, an address corresponding to a display signal between the odd-numbered scan electrode and the address electrode A and a light-emitting operation by a sustain discharge between the odd-numbered scan electrode and the sustain electrode A In the even field, the even scan electrode By performing the light emitting operation by the sustain discharge between the sustain electrode B and the address corresponding to the display signal and the even-numbered scan electrodes among dress the electrodes B, and performs efficient interlaced display.

According to a second aspect of the present invention, a plurality of odd-numbered scan electrodes 2i-1 (i = 1 to n), a plurality of even-numbered scan electrodes 2i (i = 1 to n), and the odd-numbered scan electrodes are arranged in parallel on a substrate. The paired sustain electrodes A and the paired sustain electrodes B are arranged in parallel with the even-numbered scan electrodes, and are orthogonal to the odd-numbered and even-numbered scan electrodes on another substrate that is spaced apart from and opposed to the substrate. In a plasma display panel in which a plurality of arranged address electrodes are arranged, an address corresponding to a display signal between the odd-numbered scan electrode and the address electrode A and an odd-numbered scan electrode and the sustain electrode A in an odd field when an interlace signal is received. In response to a display signal between the even-numbered scan electrode and the address electrode B in an even field. The light emitting operation by sustain discharge between the address and the even scan electrode and the sustain electrode B is performed, and the sequential scan address of the odd scan electrode and the even scan electrode and the odd scan electrode during the same field period when a sequential scan signal is received. By performing a light-emitting operation by sustain discharge between the sustain electrodes A and between the even-number scan electrodes and the sustain electrodes B, good display characteristics can be obtained by changing the number of sub-fields when receiving an interlace signal and when sequentially receiving a scan signal. What you get.

According to a third aspect of the present invention, a plurality of scan electrodes and a pair of sustain electrodes arranged in parallel with the scan electrodes are arranged on a substrate, the sustain electrodes are connected in two groups, and are separated from the substrate. In a plasma display panel in which a plurality of address electrodes orthogonally arranged to the scan electrodes are arranged on another substrate which is opposed to the substrate, the total number of scanning lines K when receiving an interlace signal and the total scanning when sequentially receiving a scanning signal When the relationship between the number of lines L is K> L and K <
2L and K and L are specific integer ratios. When an interlace signal is received, light emission between the scan electrode and the sustain electrode and light emission between the scan electrode and the sustain electrode and the scan electrode or between the sustain electrode and the scan electrode and the sustain electrode are detected. Then, at the time of sequentially receiving a scanning signal, emission of light between the scan and sustain electrodes is performed to prevent a decrease in luminance.

According to a fourth aspect of the present invention, a plurality of scan electrodes and a pair of sustain electrodes arranged in parallel with the scan electrodes are arranged on the substrate, the sustain electrodes are connected in two groups, and are separated from the substrate. In a plasma display panel in which a plurality of address electrodes orthogonally arranged to the scan electrodes are arranged on another substrate which is opposed to the substrate, the total number of scanning lines K when receiving an interlace signal and the total scanning when sequentially receiving a scanning signal When the relationship between the number of lines L is K> L and K <
2L, where K and L are specific integer ratios, and light emission between the scan electrode and the sustain electrode and light emission between the scan electrode and the sustain electrode and the scan electrode or between the sustain electrode and the scan electrode and the sustain electrode when an interlace signal is received. When a sequential scanning signal is received, light emission between the scan and sustain electrodes is performed to enable an interlace operation other than 2: 1.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the operation of a plasma display device according to an embodiment of the first invention. In the present embodiment, the area of the light emitting portion is increased according to the interlace signal to prevent a decrease in luminance. In order to prevent malfunction, the sustain electrodes are divided into two groups A and B, and the phases are changed from those of the scan electrodes. The operation waveform is shown in FIG.

FIG. 2A shows an odd field, in which only an odd number of the scan electrodes have an effective address, and an AC pulse is applied only to the sustain electrode A that is paired with the sustain electrode during light emission. . In this field, the even scan electrode and the sustain electrode group B apply the same waveform as that of the odd scan electrode to prevent the potential difference from being applied, thereby preventing erroneous discharge between the odd scan electrode and the sustain electrode B.

On the other hand, in the even field of FIG. 2B, the even-numbered scan electrodes are made effective, and a pulse voltage is applied between the scan electrodes and the sustain electrode group B to emit light. To prevent erroneous discharge, the odd scan electrode and the sustain electrode group A are set to the same phase as the even scan electrode so that no voltage is applied. With the above operation, the area of the non-light-emitting portion is reduced by using the selection of each interlace.

FIG. 3 illustrates the operation of the plasma display device according to one embodiment of the second invention. In the present embodiment, the electrode spacing is the same as the conventional one.

When receiving an interlace signal, FIG.
As shown in (1), every other scan is performed for odd and even fields. The operation waveform is the same as in FIG. At the time of receiving the progressive scanning signal, as shown in FIG. 3B, the operation is performed in the same manner as in the conventional case, and the operation waveforms are the same as in FIG. 15, and the sustain electrodes A and B have the same waveform. At this time, the feature is that the number of sub-fields for displaying gradation is changed between the interlace signal and the sequential scanning signal. This is shown in FIG.

FIG. 4A shows a subfield structure at the time of sequential scanning, which is an example of a four subfield structure. Each subfield includes a set, an address (in proportion to the number of scanning lines), and a sustain (light emission). Sustain time is 1, 2,
The gray scale is displayed with weighting at time intervals of 4 and 8. In this example, 16 gradations are possible. The progressive scanning is often a still image such as a computer image, for example.
It is overwhelming that the simple subfield structure shown in FIG.

Next, the case of an interlace signal is shown in FIG.
(B). At the time of an interlace signal, the number of subfields is increased by utilizing the fact that the address period is half in each subfield, thereby preventing a phenomenon called a moving image pseudo contour peculiar to a plasma display. This example shows an example in which the number is increased to six subfields. In most cases, the interlace signal is a moving image as used in a general television signal, and the effect of the increase of the subfield is large.

FIG. 5 shows an operation of the plasma display device according to the embodiment of the third invention. In the present embodiment, the sequential scanning is to emit light without erroneous discharge in a portion where the electrode interval is narrow, and to emit light in a portion where the electrode interval is wide in the case of an interlace signal, thereby preventing a decrease in luminance. FIG. 6 shows operation waveforms at the time of an interlace signal.

As shown in FIG. 6A, at the time of an odd field, the address of the odd-numbered scan electrode is made valid, and discharge and light emission are performed between the sustain electrode B group. At this time, the even-numbered scan electrodes are set to a voltage close to the address potential so that charges are not accumulated at the time of addressing, so that no discharge occurs between the even-numbered scan electrodes and the sustain group A during the sustain period. FIG. 6B shows an even field, in which the address of the even-numbered scan electrode is made valid, and discharge and light emission are performed between the scan electrode and the sustain electrode group A. During the sequential scanning, the sustain electrode groups A and B have the same waveform, which is the same as the conventional waveform diagram of FIG. In this case, since there is a difference in the electrode spacing, it is possible to set a voltage that does not cause erroneous discharge between the odd-numbered scan electrode and the sustain electrode group B.

A plasma display device according to an embodiment of the fourth invention is shown in FIG. 7 and will be described with reference to the drawings. Until now, the number of scanning lines for interlacing and progressive scanning was the normal case of 1: 1. However, it can be applied to other integer ratios. The example of FIG. 7 shows a case where the scanning line ratio at the time of interlace and the time of sequential scanning is 4: 3. This is a candidate for next-generation digital broadcasting.
It corresponds to the relationship of 68 sequential scans, and if both of these methods can be displayed without a conversion circuit, it is extremely effective in terms of circuit cost and display quality.

As shown in FIG. 7, in this configuration, the interval between the sustain electrode, the scan electrode, and the sustain electrode is made substantially equal, and the light emitting portions are created at odd multiple intervals by changing the combination of the scan electrode and the sustain electrode. . In the odd field, light is emitted in the following combination of the scan electrode S1 and the sustain electrode A, the scan electrode S2 and the sustain electrode B, and the scan electrode S4 and the sustain electrode A. In the even field, the scan electrode S
1, the sustain electrode B and the scan electrode S2, and the sustain electrode A, the scan electrode S3 and the sustain electrode A are addressed and emitted light.

FIG. 8 shows the driving waveform at this time. FIG.
(A) shows the waveform of the odd field, and the scan electrode S
1, S2, S4, and S5 are enabled and addressed to discharge and emit light with the sustain electrode A. At this time, the potential of the scan electrode S3 is set to a non-address potential, and the sustain period is set to the same phase as that of the sustain electrode A so that no potential is applied to prevent erroneous discharge. The sustain electrode B prevents erroneous discharge between the scan electrodes S1, S2 and the like at the same phase of the sustain period as the scan electrode S1.

In the even field of FIG. 8B, the scan electrodes S1 and S2 are simultaneously addressed, and a voltage pulse having a different phase is applied between the scan electrodes S1 and S2 during the sustain period to perform discharge and light emission. After the scan electrode S3 is also addressed, discharge and light emission are performed between the sustain electrodes A on both sides, and this is repeated. At the time of sequential scanning, discharge occurs between the scan electrodes (S1, S3, S5) in the odd rows and the sustain electrodes A, and the scan electrodes (S2, S4, S5) in the even rows.
A switch is provided for each of the three sustain electrodes so as to perform a discharge between the sustain electrode and the sustain electrode B, and the waveform can be displayed by switching the waveform at the time of interlacing. .

In the example of FIG. 7, there is no problem in the sequential scanning. However, in the interlaced operation, since the area of the light emitting portion is different between the odd field and the even field, flicker may occur. For this reason, it is necessary to adjust the luminance of a field having a large light emitting portion to the same luminance as that of one field by lowering the luminance. FIG. 9 shows an example in which this point is improved.

In the example of FIG. 9, the electrode interval is set to the scan electrode S1.
The distance between the scan electrode S1 and the sustain electrode B is changed to l, and the distance between the adjacent scan electrode S1 and the sustain electrode B is changed to l / 2. The driving waveform may be the same as in FIG. In this example, the light emission area and interval are not the same during the sequential scanning, so that there is some deterioration in the vertical resolution plane. However, flicker does not occur at this time due to the sequential scanning. This method is suitable for a display that mainly receives interlace.

Further, the inventors have found that the electrode spacing which makes the degree of deterioration on the vertical resolution plane the same during interlacing and during sequential scanning is 0.707 l, which corresponds to l / 2 in FIG. Was. Thus, a similar image can be displayed on the vertical resolution plane during both interlacing and sequential scanning.

Next, FIG. 10 shows a method for solving both the problem of flicker at the time of interlace and the deterioration of the vertical resolution surface at the time of sequential scanning. In the odd field, the light emitting units are 1, 2, 1,
In the even field, the portions 2, 1, 2, and 1 between them are made to emit light, and the light emission area is made the same in both fields to prevent flicker. In the progressive scan, the odd scan electrodes (S1, S
3, S5) and the sustain electrode A are paired, and the even-numbered scan electrodes (S2, S4, S6) and the sustain electrode B are discharged as a pair. In this example, there is no need to switch the sustain electrode between interlacing and sequential scanning.

FIG. 11 shows operation waveforms. In the odd field, the simultaneous address of the scan electrodes S1, S2, and S3 and the discharge of the sustain electrode A are performed, and the subsequent simultaneous address of S4, S5, and S6 and the discharge of the sustain electrode B are repeated.
In the even field, S1 and S2 are simultaneously discharged, the address of S3 and the discharge of the sustain electrode B are performed, and the next S4 and S5 are simultaneously discharged and the address of S6 and the discharge of the sustain electrode A are performed. With the above operation, the same light emitting area at the time of interlace can be realized.

Although the method of FIG. 10 has described the case where the scanning line ratio is 4: 3 during interlacing and sequential scanning, it is apparent that the present invention can be applied to 6: 4, 8: 5, etc. is there.

[0029]

As described above, according to the first aspect,
It is possible to increase the light emitting area at the time of interlaced light emission and improve the luminance.

According to the second aspect of the invention, it is possible to increase the number of subfields at the time of interlacing and reduce the pseudo contour at the time of receiving a moving image.

According to the third aspect of the present invention, light is emitted between wide electrodes at the time of interlacing, so that a decrease in luminance at the time of interlacing can be prevented.

According to the fourth aspect of the invention, it is possible to perform interlace display even if the number of interlaced scans and sequential scans does not correspond to 1: 1. By changing the electrode spacing from uniform, it is possible to prevent flicker due to a luminance difference between odd and even fields. Further, by setting the electrode interval to a specific value, it is possible to make the degradation of the vertical resolution plane substantially the same between the time of interlacing and the time of sequential scanning. Further, by making the light emission units the same in the odd field and the even field, it is possible to prevent flicker and uniformity of the sequential scanning at the same time.

[Brief description of the drawings]

FIG. 1 is a diagram showing an operation example of a plasma display device according to an embodiment of the first invention.

FIGS. 2A and 2B are operation waveform diagrams of FIG.

FIGS. 3A and 3B are diagrams showing an operation example of the plasma display device according to the embodiment of the second invention; FIGS.

FIGS. 4A and 4B are subfield configuration diagrams of FIG. 3;

FIG. 5 is a diagram showing an operation example of the plasma display device according to one embodiment of the third invention;

6 (a) and 6 (b) are operation waveform diagrams of FIG.

FIG. 7 is a diagram showing an operation example of the plasma display device according to one embodiment of the fourth invention;

8A and 8B are operating waveform diagrams of FIG.

FIG. 9 is a diagram showing another example of the operation of the fourth invention.

FIG. 10 is a diagram showing still another example of the operation of the fourth invention.

11A and 11B are operation waveform diagrams of FIG. 10;

FIG. 12 is a configuration diagram of a plasma display.

13A and 13B are diagrams showing a conventional operation.

FIG. 14 is a conventional operation waveform diagram.

[Explanation of symbols]

 Reference Signs List 101 Plasma display panel 102 Control circuit 103 Scan electrode drive circuit 104 Sustain electrode drive circuit 105 Address electrode drive circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 641 G09G 3/20 641R 641E 642 642D F-term (Reference) 5C080 AA05 BB05 CC03 DD01 DD09 DD27 EE29 EE30 FF12 GG08 GG09 GG12 HH02 HH04 JJ01 JJ02 JJ04

Claims (7)

[Claims] An odd scan electrode is provided on a substrate.
(I = 1 to n) and a plurality of even scan electrodes 2i (i = 1
To n), a pair of sustain electrodes A arranged in parallel with the odd-numbered scan electrodes, and a pair of sustain electrodes B arranged in parallel with the even-numbered scan electrodes, and the odd-numbered scan electrodes and the sustain electrodes A are arranged. The pitch between the even-numbered scan electrodes and the sustain electrodes B is between the odd-numbered scan electrodes and the sustain electrodes B or between the even-numbered scan electrodes and the sustain electrodes A.
A plasma display panel in which a plurality of address electrodes arranged orthogonally to the odd-numbered and even-numbered scan electrodes are arranged on another substrate which is set to be wider than a pitch interval between the substrate and the opposing and spaced-apart substrate. In the odd-numbered scan electrode and the address electrode A, an address corresponding to a display signal and a light-emitting operation by a sustain discharge between the odd-numbered scan electrode and the sustain electrode A are performed. In an even field, a light-emitting operation is performed between the even-numbered scan electrode and the address electrode B. A plasma display device which performs a light emitting operation by an address corresponding to a display signal and a sustain discharge between the even-numbered scan electrode and the sustain electrode B. 2. A substrate comprising a plurality of odd scan electrodes 2i-1.
(I = 1 to n) and a plurality of even scan electrodes 2i (i = 1
To n), a pair of sustain electrodes A arranged in parallel with the odd-numbered scan electrodes, and a pair of sustain electrodes B arranged in parallel with the even-numbered scan electrodes, and are opposed to and spaced from the substrate. In the plasma display panel in which a plurality of address electrodes orthogonal to the odd and even scan electrodes are arranged on another substrate, when an interlace signal is received, a display signal is applied between the odd scan electrode and the address electrode A in an odd field. A light emitting operation is performed by a sustained discharge between the odd-numbered scan electrode and the sustain electrode A according to a corresponding address, and an address corresponding to a display signal between the even-numbered scan electrode and the address electrode B in the even field, the even-numbered scan electrode and the sustain Performs a light emitting operation by sustain discharge between the electrodes B, and sequentially receives a scanning signal. Sometimes, the said odd scan electrodes in the same field period as the sequential scanning address of the even-numbered scan electrode and the odd-numbered scan electrode sustain electrode A
Between the even scan electrode and the sustain electrode B
A plasma display device which performs a light emission operation by sustain discharge during the period, and makes the number of subfields different between when receiving an interlace signal and when sequentially receiving a scanning signal. 3. A plurality of odd scan electrodes 2i-1 are provided on a substrate.
(I = 1 to n) and a plurality of even scan electrodes 2i (i = 1
To n), a pair of sustain electrodes A arranged in parallel with the odd scan electrodes and a pair of sustain electrodes B arranged in parallel with the even scan electrodes, and the odd scan electrodes and the sustain electrodes B are arranged. The pitch between the even-numbered scan electrode and the sustain electrode A is between the odd-numbered scan electrode and the sustain electrode A or between the even-numbered scan electrode and the sustain electrode B.
In a plasma display panel in which a plurality of address electrodes arranged orthogonally to the odd-numbered and even-numbered scan electrodes are arranged on another substrate which is set to be wider than a pitch interval between the substrates and which is arranged so as to be opposed to the substrate, an interlace signal At the time of image reception, an address corresponding to a display signal is performed between the odd scan electrode and the address electrode B in an odd field, and a light emitting operation by a sustain discharge between the odd scan electrode and the sustain electrode B is performed. A light emitting operation is performed between the address electrodes A according to a display signal and a sustain discharge between the even scan electrodes and the sustain electrodes A. During sequential scan signal reception, the odd scan electrodes and the even scans within the same field period. The progressive scan address of the electrodes and the odd scan electrodes And a light emitting operation by a sustain discharge between the sustain electrodes A and between the even scan electrodes and the sustain electrodes B. 4. A plurality of scan electrodes and a pair of sustain electrodes arranged in parallel with the scan electrodes are arranged on a substrate, and the sustain electrodes are connected in two groups, and are arranged separately from and opposed to the substrate. In a plasma display panel in which a plurality of address electrodes orthogonal to the scan electrodes are arranged on another substrate, the relationship between the total number of scanning lines K when receiving an interlace signal and the total number of scanning lines L when sequentially receiving a scanning signal Is K> L and K <2L
Where K and L are specific integer ratios. When receiving an interlace signal, light emission between the scan electrode and the sustain electrode and light emission between the scan electrode and the sustain electrode and the scan electrode or between the sustain electrode and the scan electrode and the sustain electrode are received. A plasma display device for emitting light between a scan electrode and a sustain electrode when sequentially receiving a scanning signal. 5. The relationship between K and L is 4: 3, and a pitch I between one of the sustain electrode groups A and a scan electrode i.
The relationship between the pitch Ia between the scan electrode i and the other sustain electrode group B and the pitch Ib between the sustain electrode B and the scan electrode i + 1 is that I / (Ia + Ib) is between 1 and 0.5. The plasma display device according to claim 4, wherein: 6. The relationship between K and L is 4: 3, and a pitch I between one of the sustain electrode groups A and a scan electrode i is provided.
The relationship between the pitch Ia between the scan electrode i and the other sustain electrode group B and the pitch Ib between the sustain electrode B and the scan electrode i + 1 is that I / (Ia + Ib) is near 0.707. The plasma display device according to claim 4, wherein 7. The device according to claim 4, wherein a pitch between the scan electrode i, the sustain electrode, and the scan electrode i + 1 is substantially equal, and a light emission area is equal between an odd field and an even field when an interlace signal is received. The plasma display device according to the above.